Steering system

ABSTRACT

A steering system with at least one steering wheel actuator and at least one steering actuator which are connected to each other via a controlled system. Minimal steering impulses being superimposed in order to be able to determine the steering tie rod forces that occur.

FIELD OF THE INVENTION

[0001] The invention concerns a steering system.

BACKGROUND OF THE INVENTION

[0002] The objective of the invention is achieved by a steering system of the type described.

SUMMARY OF THE INVENTION BRIEF DESCRIPTION OF THE DRAWING

[0003] The invention will now be described, by way of example, with reference to the accompanying drawing in which:

[0004]FIG. 1 is a steering system.

DETAILED DESCRIPTION OF THE INVENTION

[0005]FIG. 1 diagrammatically shows a steering system 2 having at least a steering wheel actuator 4 and at least a steering actuator 6 connected together via a controlled system 8. Minimal steering impulses are superimposed in the steering system 2 in order to be able to determine forces that occur on a steering tie rod 10 of the steering system 2. The steering impulses are sinusoidal oscillations superimposed in the steering system 2. The steering actuator 6 comprises an electric motor which can act upon a steering mechanism of a power-assisted steering system. The steering wheel actuator 4 comprises an electric motor which transmits a torque, via a steering wheel 12, back to a driver. 

1. Steering system with at least one steering wheel actuator and at least one steering actuator, which are connected together via a controlled system, characterized in that minimal steering impulses are superimposed in the steering system in order to be able to determine the steering tie rod forces that occur.
 2. Steering system according to claim 1, characterized in that the steering impulses are sinusoidal oscillations
 3. Steering system according to claim 1, characterized in that the value of the steering tie rod forces can be determined with reference to the flank shape of the steering impulses.
 4. Steering system according to claim 1, characterized in that the steering actuator comprises an electric motor which can act upon a steering mechanism of a power-assisted steering system.
 5. Steering system according to claim 1, characterized in that the steering wheel actuator comprises an electric motor which transmits back to the driver a torque via the steering wheel. 